Help Center/ Elastic Load Balance/ API Reference/ Examples/ Querying the ID of an ECS Used as a Backend Server
Updated on 2025-08-29 GMT+08:00
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Querying the ID of an ECS Used as a Backend Server

Scenarios

Call APIs to obtain the ID of an ECS used as a backend server of a load balancer.

Prerequisites

You have created a load balancer, a backend server group, and a backend server.

Procedure

Send GET /v3/{project_id}/elb/members. project_id indicates the project ID. You can add other criteria as you needed. For details, see the API document. Add X-Auth-Token to the request header.

View the response result and obtain the ECS ID from instance_id.
  • The request is successful if the following response is displayed: 
    {
    "request_id": "0df89f0ad2ecf0e0a5688978d28e9a6d",
    "members": [
        {
            "weight": 1,
            "admin_state_up": true,
            "project_id": "04dd36f9c0000fe22f9fc00b409f1sq1",
            "address": "192.168.2.96",
            "protocol_port": 80,
            "id": "0b7c1e58-5940-41c1-a7c5-dbe4b3f23e4w",
            "operating_status": ONLINE,
            "status": [
                {
                    "listener_id": "73bea9d6-fb7f-47cc-b949-c3382abb1f46",
                    "operating_status": "ONLINE"
                }
            ],
            "instance_id": "6985a0dc-5884-40f2-9426-15fb4bab8f1d", // ECS ID
            "device_id": "6985a0dc-5884-40f2-9426-15fb4bab8f1d",
            "device_owner": "compute:az1",
            "member_type": "instance",
            "created_at": "2023-05-15T07:15:43Z",
            "updated_at": "2023-05-15T07:15:53Z",
            "loadbalancer_id": "955af176-4275-49ac-b47e-05912x9dj33c",
            "loadbalancers": [
                {
                    "id": "955af176-4275-49ac-b47e-05912x9dj33c"
                }
            ],
            "pool_id": "b6e6fdcf-4f4d-4d21-95ca-925143af6de8",
            "ip_version": "v4",
            "subnet_cidr_id": "b765590e-905e-4e13-9d34-0e0ea9de2k9d"
        }
    ],
    "page_info": {
        "previous_marker": "0b7c1e58-5940-41c1-a7c5-dbe4b3f83506",
        "current_count": 1
    }
}
  • If the request is abnormal, locate the fault by referring to Error Codes.
Parent Topic: Examples